Re: [Dev-C++] singleton pattern implementation.

On 9/28/07, Younes Ouadi <ou...@em...> wrote:
> On Thu, 2007-09-27 at 20:42 -0700, Chris Miller wrote:
> > On 9/27/07, Per Westermark <pw...@ia...> wrote:
> > I've always been told to never trust anything to clean up your memory
> > for you.  It'll probably leave me to clean up a lot of memory when I
> > don't need to, but learning how to deal with memory, with particular
> > regards to scope and when things come in and out of scope, will never
> > hurt IMHO.
> >
> Chris,
>
> We are talking here about something basic: modern OS (UNIX, Linux,
> Windows ...) insures getting back memory allocated to a process once
> this process is over.
>
> Don't confuse this fact with the fact that memory leak is one of the
> issues that C and C++ developers should take seriously. Memory leak is
> the fact that a process allocates memory dynamically and left it behind
> without releasing it and this while the process is still running. This
> means that while the process is still running, it takes memory from the
> OS and waste it.

Understood.

> However, once the process is over, modern OS take back this memory. This
> is not the case of Embedded OS since these later do not enjoy the same
> conditions like the non Embedded OS.

Makes sense.

> Now, let me highlight the issue mentioned by /pwm. There are some
> resources that the OS cannot get back or cannot get back easily. Let us
> mention here:
> * a process that creates a temporary file and, by design, this process
> should delete this file before it ends. If this process doesn't do so,
> the OS cannot do it in its place. And here come up the importance of the
> concept of destructor. It can be used by a given application to release
> this kind of resources since the compiler insures calling a class
> destructor while releasing objects of this class
> * a process that opens a socket should close it properly before it ends.
> Otherwise, it will stay in the OS for a while before that this later
> release it which is not a good behavior of the process.

Okay.

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